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I shoot a combo of full frame lenses and ASPC lenses. Probably my best bet is the metabones speedbooster ultra I guess, as the XL would vignette with APSC lenses. Or am I missing something or an other option?

They are worried about the sensor cover glass thickness, which was an issue with the BMCC and BMPPC, but these were smaller sensors, and the issue was mainly with the Sigma 18-35 and other very fast lenses being used at f/1.4 or more.
Let’s nit invent issues, where their are none at this point in time. Wait until the camera is out (released), trsted, and then see if their is an issue. If not, then the current new Ultra and XL SB should be fine.
Cheers

From what Iíve read the current crop of SpeetBoosters cover the GH5s fine, and will therefore cover the 4KPCC fine. Why is everyone so worried about this?

Originally Posted by Denny Smith

They are worried about the sensor cover glass thickness, which was an issue with the BMCC and BMPPC, but these were smaller sensors, and the issue was mainly with the Sigma 18-35 and other very fast lenses being used at f/1.4 or more.
Letís nit invent issues, where their are none at this point in time. Wait until the camera is out (released), trsted, and then see if their is an issue. If not, then the current new Ultra and XL SB should be fine.
Cheers

Sorry to be blunt but you guys have no idea what your are talking about. I politely request you stop posting in this thread. You are posting misinformation.

Denny Smith, I applaud you for realizing that sensor stack thickness is an issue, but I am baffled by the bizarre relationship you draw between stack thickness and surface area. You are 100% wrong.

Canon sensors are way bigger (surface area wise) than m43 sensors and yet their sensor stack thickness is a fraction of the size. In fact their stack thickness is closer to the size of smaller Blackmagic sensors.